package org.walkerljl.practice.asyncparallel;

import org.walkerljl.commons.datetime.DateUtils;
import org.walkerljl.practice.Task;

import java.util.concurrent.*;

/**
 * 使用CompletionService自带的阻塞队列获取执行结果。
 * Task执行成功之后，才会将Future扔到BlockingQueue
 * @author lijunlin
 */
public class CompletionServiceTest {

    public static void main(String[] args) {
        ExecutorService executorService = Executors.newCachedThreadPool();
        CompletionService<Integer> completionService = new ExecutorCompletionService<Integer>(executorService);
        int taskAmount = 10;
        for (int i = taskAmount; i > 0; i--) {
            completionService.submit(new Task((long)i, i * 5));
        }

        for (int i = taskAmount; i > 0; i--) {
            try {
                System.out.println(DateUtils.getCurrentDateTime() + "->" + completionService.take().get());
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        }
    }
}
